Fill a large pot with lightly salted water and bring to a rolling boil over high heat
Stir in the lasagna noodles, and return to a boil
Cook the pasta uncovered, stirring occasionally, until the noodles are cooked, but still firm to the bite, about 8 minutes; drain and rinse
Preheat oven to 375 degrees F (190 degrees C)
Heat oil in a skillet over medium heat; cook and stir mushrooms until they soften, about 5 minutes
Stir in spinach, and cook until hot; remove from heat
Stir together the chicken, ricotta cheese, Parmesan cheese, oregano, and the cooked spinach mixture in a large bowl
Season to taste with salt and black pepper
Spread about 1/4 cup of the mixture on each lasagna noodle
Roll the noodle up, and place seam-side down into the prepared baking dish
Repeat for each noodle
Spoon Alfredo sauce over the rollups
Bake, covered, in the preheated oven for 40 minutes
Uncover; sprinkle with mozzarella cheese and pine nuts
Return to the oven and bake until the cheese is melted and bubbly and the pine nuts are toasted, about 10 minutes. Serve hot